c# dll in vfp, Unable to use

Question

I have written my code in c#, and build dll. When I m creating object in vfp, Im getting error.

I am using below code in vfp

SET LIBRARY TO bt_print.tlb
hh=CREATEOBJECT("bt_print.bt")

My c# code is

I have checked "Register for COM interop" check box.

Please correct me , what i am doing wrong.

Thanks in advance.

Answer 1

Checkmark the "Make the Assembly COM-Visible" - Project Settings, Application Page, Assembly Information.

In C#, add the ClassInterface and ProgId.

using System;
using System.Runtime.InteropServices;

namespace bt_print

{
    [ClassInterface(ClassInterfaceType.AutoDual)]
    [ProgId("bt_print.bt")]
    public class bt
    {
        public void search_bt()
        {
        }

        public void sendfile(String fl)
        {
        }
    }
}

In VFP, use the NEWOBJECT() function.

hh = NEWOBJECT("bt_print.bt")